所有的理论都是源于实践。

All theories originate from practice.

youdao

exi格式使用一种源于信息和正式语言理论的混合方法以及经过测量验证的实践技术对XML信息进行熵编码。

The EXI format USES a hybrid approach drawn from the information and formal language theories, plus practical techniques verified by measurements, for entropy encoding XML information.

youdao

所有的理论都来源于实践，并反过来为实践服务。

All theories originate from practice and in turn serve practice.

youdao